Abstract
The refractive indices of the cholesteric liquid crystal solution were measured using multiwavelength (visible range) refractometer for three different wavelengths. Measurements were made at different temperatures for various concentrations of the solution, mixing CLC in a soluble solvent. Vuks equation describes the wavelength and temperature dependence of refractive indices of anisotropic crystalline materials. We have used a simplified version of Vuks equation relating only to macroscopic indices and verified its validity for five-different-concentration solution at various temperatures. The result is also used to obtain molecular polarizabilities and temperature dependent material constants of our sample.
Highlights
The importance of liquid crystals lies in their thermal, electrical, and optical properties [1,2,3]
Vuks made a bold assumption that the internal field in a liquid crystal is the same in all directions and gave a semi-empirical equation correlating the refractive indices with the molecular polarizabilities for anisotropic materials [9]: n2e,o n2
In this paper we tried to verify this equation by finding out refractive indices of Cholesteric LC solution of five different concentrations prepared by us with varying its temperature
Summary
The importance of liquid crystals lies in their thermal, electrical, and optical properties [1,2,3]. Vuks made a bold assumption that the internal field in a liquid crystal is the same in all directions and gave a semi-empirical equation correlating the refractive indices with the molecular polarizabilities for anisotropic materials [9]: n2e,o n2. Li and Wu [14] modified this equation and showed that the validity of Vuks equations can be examined by measuring the temperature and wavelength-dependent refractive indices of liquid crystals. The importance of modified Vuks equations (3) is that the sophisticated microscopic Vuks equation can be validated by two simple macroscopic parameters: n2 and n These two parameters can be obtained by measuring the individual refractive indices (ne and no) of the liquid crystal. In this paper we tried to verify this equation by finding out refractive indices of Cholesteric LC solution of five different concentrations prepared by us with varying its temperature
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